Finding the Fourth Proportional to 9,084.42, 13,629.20 and 8,216.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,084.42 : 13,629.20 = 8,216.91 : x
2. Step 2: Convert to fraction form
   9,084.42/13,629.20 = 8,216.91/x
3. Step 3: Cross multiply
   9,084.42x = 13,629.20 × 8,216.91
4. Step 4: Simplify right side
   9,084.42x = 111,989,868.69
5. Step 5: Solve for x
   x = 111,989,868.69/9,084.42
6. Step 6: Final answer
   x = 12,327.69